US8787143B2 - Method and apparatus for hybrid FDM-CDM structure for single carrier based control channels - Google Patents

Method and apparatus for hybrid FDM-CDM structure for single carrier based control channels Download PDF

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US8787143B2
US8787143B2 US12/443,953 US44395307A US8787143B2 US 8787143 B2 US8787143 B2 US 8787143B2 US 44395307 A US44395307 A US 44395307A US 8787143 B2 US8787143 B2 US 8787143B2
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subcarriers
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Durga Prasad Malladi
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Qualcomm Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0016—Time-frequency-code
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/692—Hybrid techniques using combinations of two or more spread spectrum techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H04J13/0062—Zadoff-Chu
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H04J13/18—Allocation of orthogonal codes
    • H04J13/20—Allocation of orthogonal codes having an orthogonal variable spreading factor [OVSF]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H04L5/0041—Frequency-non-contiguous
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/06—Channels characterised by the type of signal the signals being represented by different frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H04J2013/165—Joint allocation of code together with frequency or time
    • H04J27/2613—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H04L27/26134—Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0026—Division using four or more dimensions

Definitions

  • the following description relates generally to wireless communications, and more particularly to a hybrid FDM (frequency division multiplexing)-CDM (code division multiplexing) structure for single carrier based control channels that provides increased frequency diversity for a given user.
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • Wireless communication systems are widely deployed to provide various types of communication content such as, for example, voice, data, and so on.
  • Typical wireless communication systems may be multiple-access systems capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, . . . ).
  • multiple-access systems may include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and the like.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • wireless multiple-access communication systems may simultaneously support communication for multiple mobile devices.
  • Each mobile device may communicate with one or more base stations via transmissions on forward and reverse links.
  • the forward link (or downlink) refers to the communication link from base stations to mobile devices
  • the reverse link (or uplink) refers to the communication link from mobile devices to base stations.
  • communications between mobile devices and base stations may be established via single-input single-output (SISO) systems, multiple-input single-output (MISO) systems, multiple-input multiple-output (MIMO) systems, and so forth.
  • SISO single-input single-output
  • MISO multiple-input single-output
  • MIMO multiple-input multiple-output
  • MIMO systems commonly employ multiple (N T ) transmit antennas and multiple (N R ) receive antennas for data transmission.
  • a MIMO channel formed by the N T transmit and N R receive antennas may be decomposed into N S independent channels, which may be referred to as spatial channels, where N S ⁇ N T , N R ⁇ .
  • Each of the N S independent channels corresponds to a dimension.
  • MIMO systems may provide improved performance (e.g., increased spectral efficiency, higher throughput and/or greater reliability) if the additional dimensionalities created by the multiple transmit and received antennas are utilized.
  • MIMO systems may support various duplexing techniques to divide forward and reverse link communications over a common physical medium.
  • frequency division duplex (FDD) systems may utilize disparate frequency regions for forward and reverse link communications.
  • time division duplex (TDD) systems forward and reverse link communications may employ a common frequency region.
  • Conventional techniques do not allow users to transmit over non-contiguous tones and thus cannot provide a given user a maximum frequency diversity to employ the entire available bandwidth to transmit a signal.
  • an apparatus operable in wireless communication system to maximize frequency diversity from a user's perspective includes means for performing frequency division multiplexing (FDM) on signals from users in different groups and means for performing code division multiplexing (CDM) in frequency domain on signals from users in the same group. Furthermore, the apparatus includes means for performing code division multiplexing (CDM) in time domain on signals from users in the same group.
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • Another aspect of the specification relates to a method that maximizes frequency diversity for a given user for transmitting single carrier control signals in the available bandwidth.
  • the method includes frequency division multiplexing (FDM) signals from users in different groups, code division multiplexing (CDM) in frequency domain signals from users in the same group and code division multiplexing (CDM) in time domain signals from users in the same group.
  • FDM frequency division multiplexing
  • CDM code division multiplexing
  • CDM code division multiplexing
  • An aspect of the specification discloses an apparatus operable in wireless communication system that maximizes frequency diversity from a user's perspective.
  • the apparatus comprises a hybrid FDM-CDM receiving component that identifies a received signal from the user in the given cell, wherein the received signal employs a hybrid FDM-CDM scheme.
  • the received signal is demodulated and despread in time and frequency domain at the receiving end to determine a transmitted signal.
  • a method that facilitates retrieval of a single carrier control signal includes receiving an incoming signal that supports a hybrid FDM-CDM (frequency division multiplexing-code division multiplexing) structure.
  • the received signal is demodulated by employing most any demodulation technique.
  • the method further includes despreading the received signal in time domain and despreading the received signal in frequency domain to obtain a signal transmitted by a specific user in a given cell.
  • the wireless communications apparatus comprises means for receiving an incoming signal that supports a hybrid FDM-CDM (frequency division multiplexing-code division multiplexing) structure. Furthermore, the wireless communications apparatus comprises means for demodulating the received signal and means for despreading the received signal in time domain and frequency domain to determine a signal transmitted by a particular user from a particular cell.
  • FDM-CDM frequency division multiplexing-code division multiplexing
  • the hybrid FDM-CDM structure maximizes frequency diversity from a specific user's perspective.
  • a wireless communications apparatus comprising a memory that retains instructions related to transmitting a single carrier control channel that employs a hybrid FDM-CDM structure.
  • the wireless communications apparatus also includes a processor coupled to the memory, configured to execute the instructions retained in the memory.
  • the system includes a processor configured to divide a control channel into one or more groups that are frequency division multiplexed (FDM) with each other and perform code division multiplexing (CDM) on control channel signals from users within each of the one or more groups in time and frequency domain.
  • FDM frequency division multiplexed
  • CDM code division multiplexing
  • a wireless communications apparatus comprises a memory that retains instructions related to receiving a single carrier control channel that employs a hybrid FDM-CDM structure and a processor coupled to the memory, configured to execute the instructions retained in the memory.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more aspects. These aspects are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed and the described aspects are intended to include all such aspects and their equivalents.
  • FIG. 1 is an illustration of a wireless communication system in accordance with various aspects set forth herein.
  • FIG. 2 is an illustration of a wireless communication system with multiple base stations and multiple terminals, such as may be utilized in conjunction with one or more aspects.
  • FIG. 3 is an illustration of an example system that transmits a signal with a hybrid FDM-CDM (frequency division multiplexing-code division multiplexing) structure, according to an aspect of the system.
  • FDM-CDM frequency division multiplexing-code division multiplexing
  • FIG. 4 is an illustration of an example system that receives a signal with a hybrid FDM-CDM structure in accordance with an aspect of the system.
  • FIG. 5 is an illustration of an example methodology that facilitates transmission of a signal employing a hybrid FDM-CDM structure, according to an aspect of the specification.
  • FIG. 6 is an illustration of an example methodology that facilitates recovery of a signal transmitted by a user employing a hybrid FDM-CDM structure in a wireless communication system.
  • FIGS. 7A-B illustrate example graphs that depict the frequency at which a user can transmit single carrier control channels by employing conventional systems.
  • FIG. 8 is an illustration of an example hybrid FDM-CDM that facilitates an increase in frequency diversity from a given user's perspective, according to an aspect of the system
  • FIG. 9 is an illustration of an example time domain CDM structure that can maintain orthogonality between pilots during inter cell transmissions in accordance with an aspect of the subject specification.
  • FIG. 10 is an illustration of an example mobile device that employs a hybrid FDM-CDM structure to transmit a signal, in accordance with an aspect of the subject disclosure.
  • FIG. 11 is an illustration of an example system that facilitates recovery of a signal that employs a hybrid FDM-CDM structure, according to an aspect of the system.
  • FIG. 12 is an illustration of an example wireless network environment that can be employed in conjunction with the various systems and methods described herein.
  • FIG. 13 is an illustration of an example system that facilitates transmission of signal that supports a hybrid FDM-CDM structure.
  • FIG. 14 is an illustration of an example system that receives a signal that supports a hybrid FDM-CDM structure.
  • a component may be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer.
  • an application running on a computing device and the computing device can be a component.
  • One or more components can reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers.
  • these components can execute from various computer readable media having various data structures stored thereon.
  • the components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the Internet with other systems by way of the signal).
  • a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the Internet with other systems by way of the signal).
  • the terms “reference signal,” “pilot” and the like are used interchangeably in this application and are intended to refer to a signal transmitted over a communications system for supervisory, control, equalization, continuity, synchronization, reference purposes and the like.
  • a mobile device can also be called a system, subscriber unit, subscriber station, mobile station, mobile, remote station, remote terminal, access terminal, user terminal, terminal, wireless communication device, user agent, user device, or user equipment (UE).
  • a mobile device may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device having wireless connection capability, computing device, or other processing device connected to a wireless modem.
  • SIP Session Initiation Protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • a base station may be utilized for communicating with mobile device(s) and may also be referred to as an access point, Node B, or some other terminology.
  • various aspects or features described herein may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques.
  • article of manufacture as used herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media.
  • computer-readable media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips, etc.), optical disks (e.g., compact disk (CD), digital versatile disk (DVD), etc.), smart cards, and flash memory devices (e.g., EPROM, card, stick, key drive, etc.).
  • various storage media described herein can represent one or more devices and/or other machine-readable media for storing information.
  • the term “machine-readable medium” can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.
  • System 100 comprises a base station 102 that may include multiple antenna groups.
  • one antenna group may include antennas 104 and 106
  • another group may comprise antennas 108 and 110
  • an additional group may include antennas 112 and 114 .
  • Two antennas are illustrated for each antenna group; however, more or fewer antennas may be utilized for each group.
  • Base station 102 may additionally include a transmitter chain and a receiver chain, each of which can in turn comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.), as will be appreciated by one skilled in the art.
  • Base station 102 may communicate with one or more mobile devices such as mobile device 116 and mobile device 122 ; however, it is to be appreciated that base station 102 may communicate with substantially any number of mobile devices similar to mobile devices 116 and 122 .
  • Mobile devices 116 and 122 can be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over wireless communication system 100 .
  • mobile device 116 is in communication with antennas 112 and 114 , where antennas 112 and 114 transmit information to mobile device 116 over a forward link 118 and receive information from mobile device 116 over a reverse link 120 .
  • mobile device 122 is in communication with antennas 104 and 106 , where antennas 104 and 106 transmit information to mobile device 122 over a forward link 124 and receive information from mobile device 122 over a reverse link 126 .
  • forward link 118 may utilize a different frequency band than that used by reverse link 120
  • forward link 124 may employ a different frequency band than that employed by reverse link 126 , for example.
  • forward link 118 and reverse link 120 may utilize a common frequency band and forward link 124 and reverse link 126 may utilize a common frequency band.
  • the set of antennas and/or the area in which they are designated to communicate may be referred to as a sector of base station 102 .
  • multiple antennas may be designed to communicate to mobile devices in a sector of the areas covered by base station 102 .
  • the transmitting antennas of base station 102 may utilize beamforming to improve signal-to-noise ratio of forward links 118 and 124 for mobile devices 116 and 122 .
  • base station 102 utilizes beamforming to transmit to mobile devices 116 and 122 scattered randomly through an associated coverage
  • mobile devices in neighboring cells may be subject to less interference as compared to a base station transmitting through a single antenna to all its mobile devices.
  • System 200 can comprise one or more access points 202 that receive, transmit, repeat, etc., wireless communication signals to each other and/or to one or more terminals 204 .
  • Each base station 202 can comprise multiple transmitter chains and receiver chains, e.g., one for each transmit and receive antenna, each of which can in turn comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.).
  • Terminals 204 can be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs, and/or any other suitable device for communicating over wireless system 200 .
  • each terminal 204 can comprise one or more transmitter chains and a receiver chains, such as used for a multiple input multiple output (MIMO) system.
  • Each transmitter and receiver chain can comprise a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.), as will be appreciated by one skilled in the art.
  • each access point provides communication coverage for a particular geographic area 206 .
  • the term “cell” can refer to an access point and/or its coverage area, depending on context. To improve system capacity, an access point coverage area can be partitioned into multiple smaller areas (e.g., three smaller areas 208 A, 208 B and 208 C). Each smaller area is served by a respective base transceiver subsystem (BTS).
  • BTS base transceiver subsystem
  • the term “sector” can refer to a BTS and/or its coverage area depending upon context. For a sectorized cell, the base transceiver subsystem for all sectors of the cell is typically co-located within the access point for the cell.
  • Terminals 204 are typically dispersed throughout system 200 . Each terminal 204 may be fixed or mobile. Each terminal 204 may communicate with one or more access points 202 on the forward and reverse links at any given moment.
  • a system controller 210 couples access points 202 and provides coordination and control of access points 202 .
  • access points 202 may communicate with one another as needed. Communication between access points via system controller 210 or the like can be referred to as backhaul signaling.
  • the techniques described herein may be used for a system 200 with sectorized cells as well as a system with un-sectorized cells. For clarity, the following description is for a system with sectorized cells.
  • the term “access point” is used generically for a fixed station that serves a sector as well as a fixed station that serves a cell.
  • the terms “terminal” and “user” are used interchangeably, and the terms “sector” and “access point” are also used interchangeably.
  • a serving access point/sector is an access point/sector with which a terminal communicates.
  • a neighbor access point/sector is an access point/sector with which a terminal is not in communication.
  • system 300 that generates a hybrid FDM-CDM structure for a signal that is to be transmitted.
  • system 300 can be part of most any communication system (not shown), e.g., an LTE (Long Term Evolution) system.
  • LTE systems can generally focus toward, but are not limited to, improving efficiency, lowering costs, improving services, making use of new spectrum opportunities, and better integration with other open standards etc.
  • LTE systems can employ OFDMA (Orthogonal Frequency Division Multiple Access) for the downlink (tower to mobile device) and a Single Carrier wave for the uplink (mobile device to tower).
  • the system can employ MIMO (Multiple-input and multiple-output), with two or more antennas per station.
  • MIMO Multiple-input and multiple-output
  • OFDM modulation achieves multiple access by assigning subsets of subcarriers to individual users.
  • each user can be allocated a specific set of tones to transmit a signal to a base station.
  • conventional systems employ a single carrier modulation technique that does not permit a user to transmit on different non-contiguous tones.
  • FDM frequency division multiplexing
  • logical channels can be classified into control channels and traffic channels.
  • logical control channels can comprise a Broadcast Control Channel (BCCH) which is a DL (Down Link) channel for broadcasting system control information, a Paging Control Channel (PCCH) which is a DL channel that transfers paging information, and/or a Multicast Control Channel (MCCH) which is a point-to-multipoint DL channel used for transmitting multimedia broadcast and multicast service (MBMS) scheduling and control information for one or several MTCHs.
  • BCCH Broadcast Control Channel
  • PCCH Paging Control Channel
  • MCCH Multicast Control Channel
  • MCCH Multicast Control Channel
  • MBMS multimedia broadcast and multicast service
  • RRC Radio Resource Control
  • a Dedicated Control Channel is a point-to-point bi-directional channel that transmits dedicated control information and is employed by UEs having an RRC connection.
  • logical traffic channels comprise a Dedicated Traffic Channel (DTCH), which is point-to-point bi-directional channel, dedicated to one UE, for the transfer of user information, and, a Multicast Traffic Channel (MTCH) that point-to-multipoint DL channel for transmitting traffic data.
  • DTCH Dedicated Traffic Channel
  • MTCH Multicast Traffic Channel
  • transport channels can be typically classified into DL (Down Link) and UL (Up Link) channels.
  • DL transport channels can comprise a Broadcast Channel (BCH), Downlink Shared Data Channel (DL-SDCH) and a Paging Channel (PCH), the PCH that can support of UE power saving (DRX cycle is indicated by the network to the UE), broadcasted over entire cell and mapped to PHY resources which can be used for other control/traffic channels.
  • the UL transport channels can comprise a Random Access Channel (RACH), a Request Channel (REQCH), an Uplink Shared Data Channel (UL-SDCH) and one or more PHY channels.
  • RACH Random Access Channel
  • REQCH Request Channel
  • UL-SDCH Uplink Shared Data Channel
  • the PHY channels can comprise a set of DL channels and UL channels, such as, but not limited to, a Common Pilot Channel (CPICH), a Synchronization Channel (SCH), a Common Control Channel (CCCH), a Shared DL Control Channel (SDCCH), a Multicast Control Channel (MCCH), a Shared UL Assignment Channel (SUACH), an Acknowledgement Channel (ACKCH), a DL Physical Shared Data Channel (DL-PSDCH), an UL Power Control Channel (UPCCH), a Paging Indicator Channel (PICH), a Load Indicator Channel (LICH), a Physical Random Access Channel (PRACH), a Channel Quality Indicator Channel (CQICH), an Acknowledgement Channel (ACKCH), an Antenna Subset Indicator Channel (ASICH), a Shared Request Channel (SREQCH), an UL Physical Shared Data Channel (UL-PSDCH), a Broadband Pilot Channel (BPICH), etc.
  • CPICH Common Pilot Channel
  • SCH Common Control Channel
  • a channel structure that preserves low PAR (such that at any given time, the channel is contiguous or uniformly spaced in frequency) properties of a single carrier waveform.
  • the structure provided by conventional systems does not permit a user to transmit over non-contiguous channels.
  • the system 300 can include a hybrid FDM-CDM generating component 302 that can be employed to achieve maximum frequency diversity for a user over a given bandwidth such that the user can transmit a signal over different non-contiguous tones.
  • the hybrid FDM-CDM generating component 302 can include a hybrid FDM-CDM modulator 304 that can receive a signal to be transmitted (e.g. control signal) and modulate the signal employing a hybrid FDM-CDM technique.
  • the hybrid FDM-CDM technique can be a combination of FDM and FD-CDM (frequency domain code division multiplexing).
  • the hybrid FDM-CDM technique can provide increased frequency diversity to users in a given cell, such that, each user can transmit over the entire available bandwidth.
  • the hybrid FDM-CDM modulator 304 can employ cyclic shifts of most any spreading sequence, e.g., Zadoff-Chu (ZC) sequence to achieve multiple access communication.
  • ZC Zadoff-Chu
  • frequency hopping techniques can be employed to achieve greater frequency diversity and utilize the available bandwidth more efficiently.
  • the modulated signal can then be sent to a Reference signal (RS) multiplexer 306 that can be employed to further multiplex the signal.
  • the RS multiplexer 306 can employ time-domain CDM such that users in different cells can be identified at a receiver. Thus, users in neighboring cells can utilize the same bandwidth and the same ZC sequence for FD-CDM.
  • a spreading operation can be performed by the RS multiplexer 304 by employing most any spreading code in time domain. As an example, a sequence can be multiplied by a unique Hadamard code in time domain. It can be appreciated that the RS multiplexer 306 can employ most any orthogonal code.
  • the RS multiplexer 306 ensures that pilots of users in different cells that use the same sequence for modulation do not interfere.
  • the multiplexed signal can be transmitted to a receiver or a base station (not shown) via an antenna.
  • the multiplexed signal can be processed at the receiver to determine the original signal.
  • System 400 generally includes a hybrid FDM-CDM receiving component 402 that can receive an incoming signal via one or more antennas (not shown).
  • the hybrid FDM-CDM receiving component 402 can be part of most any communications system (e.g. a MIMO system) at the receiver end, such as a base station or a mobile device.
  • the received signal is demodulated by the demodulator 404 to separate out groups of users from each cell. It can be appreciated that most any demodulation technique can be employed to identify different groups. As an example, a FFT (Fast Fourier Transform) can be employed for frequency demodulation by the demodulator 404 . Furthermore, if a frequency hopping scheme has been utilized at the transmitter, the demodulator 404 can employ the inverse hopping sequence to detect the signal at the receiving end. Thus, the demodulator 404 can separate out signals from a set of users in different cells.
  • FFT Fast Fourier Transform
  • the demodulated signal can now be employed to separate out signals from each user in each cell by performing a despreading operation on each set of users identified by the demodulator 404 , which can be carried out by the despreader 406 .
  • the despreader 406 can perform a despreading operation on the demodulated signal in time and frequency domain to recover a signal transmitted by a specific user in a specific cell.
  • the despreader 406 can employ one or more despreading filters to identify a signal from a specific user from the group of users in a cell.
  • the despreading filters can employ a despreading code that is the inverse of the spreading code employed by the user during transmission.
  • FIG. 5 illustrates a methodology 500 to transmit a signal employing a hybrid FDM-CDM structure, in accordance with an aspect of the specification.
  • the one or more methodologies shown herein e.g., in the form of a flow chart, are shown and described as a series of acts, it is to be understood and appreciated that the subject specification is not limited by the order of acts, as some acts may, in accordance with the specification, occur in a different order and/or concurrently with other acts from that shown and described herein.
  • a methodology could alternatively be represented as a series of interrelated states or events, such as in a state diagram.
  • not all illustrated acts may be required to implement a methodology in accordance with the specification.
  • the signal to be transmitted can be received at 502 .
  • the received signal can then be modulated employing a hybrid FDM-CDM structure at 504 .
  • Modulation can allow each user to occupy the entire bandwidth available.
  • Chu-multiplexing can be employed to modulate the received signal such that each user in a given cell can occupy non-contiguous set of tones.
  • the signal can be frequency hopped to achieve increased frequency diversity.
  • the FDM-CDM signal is further multiplexed in the time domain at 506 .
  • a spreading code is employed to perform code division multiplexing in the time domain.
  • a Hadamard sequence of length 4 can be multiplied to the FDM-CDM signal.
  • most any orthogonal sequence of any length can be employed for multiplexing.
  • CDM in time domain maintains orthogonality of the pilot of users in different (neighboring) cells and can be employed to create multiple reference signals across cells.
  • FIG. 6 illustrates a methodology 600 that recovers a signal transmitted by a user employing a hybrid FDM-CDM structure.
  • An incoming signal is received at 602 .
  • the signal can be received by one or more antenna and then demodulated at 604 to separate out signals transmitted by groups of users from different cells that use the same bandwidth.
  • the demodulation can be performed by most any frequency demodulation technique, such as, but not limited to, an FFT.
  • frequency demodulation can be employed to identify signals from a set of users from a given cell.
  • the signal from each user in the given cell can be separated out by performing signal despreading in the time and frequency domain.
  • a despreading operation in the time domain can be performed on the demodulated signal at 606 .
  • a despreading operation in the frequency domain can be performed on the demodulated signal at 608 .
  • despreading filtering technique can be employed to filter out a signal from a particular user in a given cell.
  • the filtering technique can employ a despreading code that is an inverse of the spreading code employed by the particular user during transmission.
  • a signal from a particular user in a particular cell can be identified and each signal can be further processed at 610 .
  • FIGS. 7A-7B illustrate example graphs that depict a frequency at which a user can transmit single carrier control channels employing conventional systems.
  • FIG. 7A depicts a SU-MIMO (single user multiple input multiple output) or SDMA (space division multiple access) structure wherein two users can transmit signals over contiguous tones.
  • An FDM RS (reference signal) structure 702 can be employed for intra-cell transmission.
  • communication systems transmit reference signals to serve several receiver and system purposes including, but not limited to, channel medium estimation for coherent demodulation of the data signal at the receiver and channel quality estimation for transmission scheduling purposes.
  • two streams can occupy the same bandwidth.
  • These streams can be from the same UE (SU-MIMO) or different UEs (SDMA).
  • the RS for both streams can be orthogonally transmitted using FDM.
  • all the 0's and 1's are transmitted together in contiguous tones. Initially, stream 0 occupies the lower half of the bandwidth while stream 1 occupies the upper half. During the next transmission, stream 1 occupies the lower half of the bandwidth while stream 0 occupies the upper half.
  • the two streams cannot be interleaved with each other in the spectrum. Thus, conventional systems do not permit streams to transmit on non-contiguous tones.
  • FIG. 7B illustrates a conventional FDM multiplexing structure 704 with six streams ( 0 , 1 , 2 , 3 , 4 and 5 ) that occupy a given bandwidth (e.g. 180 KHz).
  • Each stream represents a signal from a user in a given cell.
  • users from the given cell can employ the structure 704 to transmit a control signal (e.g. ACK, CQI, etc.).
  • the users can occupy different parts of the spectrum that have been allocated to them, as shown.
  • no other user can occupy the spectrum utilized by a particular user.
  • user 3 cannot occupy the part of the spectrum occupied by user 0 .
  • a frequency hopping scheme can be employed to increase the frequency diversity for a given user. For example, user 0 occupies the lowest frequency in the first two symbols but hops to a higher frequency in the third symbol.
  • conventional systems do not permit one set of tones to be occupied by more than one user, thus limiting frequency diversity.
  • a user can occupy only two tones in the entire bandwidth that is available. For example, user 0 can occupy only 60 KHz of the total 180 KHz available bandwidth, even after implementing a frequency hopping scheme.
  • FIG. 8 illustrates an example hybrid FDM-CDM structure 800 to further increase frequency diversity from a given user's perspective, according to an aspect of the specification.
  • each user can occupy the entire available bandwidth and thus frequency diversity can be maximized.
  • each user 0 - 5 can transmit over the entire bandwidth of 180 KHz.
  • users can transmit over non-contiguous tones and achieve maximum frequency diversity.
  • the hybrid FDM-CDM structure can be generated by multiplexing, as described supra. For example, a Chu sequence can be employed as a frequency domain spreading code during multiplexing.
  • This hybrid FDM-CDM structure 800 can be employed to transmit from multiple users in a given cell.
  • FIG. 9 there illustrated is an example time domain CDM structure 900 that can maintain orthogonality between pilots during inter cell transmissions.
  • a length 4 Hadamard sequence is employed in structure 900 .
  • the [+] and [ ⁇ ] symbols illustrated, represent orthogonal covers.
  • the sequences [+][+][+][+], [+][+][ ⁇ ][ ⁇ ], [+][ ⁇ ][+][ ⁇ ], and, [+][ ⁇ ][ ⁇ ][+] are orthogonal to each other in time.
  • a user from a given cell can employ this orthogonal spreading code in time domain, as seen from the figure, to avoid interference with a pilot of another user from a neighboring cell, along with the sequence in frequency domain (as seen from the structure 800 in FIG. 8 ).
  • a given cell can be allocated one of the four Hadamard sequences illustrated in FIG. 9 .
  • Users in a given cell can employ a particular Hadamard sequence such that users in neighboring cells employ different orthogonal sequences.
  • signals transmitted by users from different cells can easily be identified, even though the users employ the same spreading code in frequency domain.
  • a despreading operation can be performed at the receiver in time domain to separate out users from neighboring cells that employ the same spreading code in the frequency domain.
  • a length 2 Hadamard sequence can be employed for time domain CDM.
  • This sequence can provide a symmetric structure with downlink and simplify the implementation with reuse of blocks across uplink and downlink.
  • increased number of Chu sequences can be available as RS, especially for smaller bandwidth allocation.
  • the structures 800 (from FIGS. 8) and 900 (from FIG. 9 ) achieve the maximum frequency diversity over the entire bandwidth while retaining orthogonality between users in a given cell. Furthermore, they maintain orthogonality of the pilot based on a despreading operation between cells.
  • FIG. 10 is an illustration of an example mobile device 1000 that employs a hybrid FDM-CDM structure to transmit a signal, in accordance with an aspect of the system.
  • Mobile device 1000 comprises a receiver 1002 that receives a signal from, for instance, a receive antenna (not shown), and performs typical actions thereon (e.g., filters, amplifies, downconverts, etc.) the received signal and digitizes the conditioned signal to obtain samples.
  • typical actions thereon e.g., filters, amplifies, downconverts, etc.
  • Receiver 1002 can be, for example, an MMSE receiver, and can comprise a demodulator 1004 that can demodulate received symbols and provide them to a processor 1006 for channel estimation.
  • Processor 1006 can be a processor dedicated to analyzing information received by receiver 1002 and/or generating information for transmission by a transmitter 1016 , a processor that controls one or more components of mobile device 1000 , and/or a processor that both analyzes information received by receiver 1002 , generates information for transmission by transmitter 1016 , and controls one or more components of mobile device 1000 .
  • Mobile device 1000 can additionally comprise memory 1008 that is operatively coupled to processor 1006 and that may store data to be transmitted, received data, information related to available channels, data associated with analyzed signal and/or interference strength, information related to an assigned channel, power, rate, or the like, and any other suitable information for estimating a channel and communicating via the channel.
  • Memory 1008 can additionally store protocols and/or algorithms associated with estimating and/or utilizing a channel (e.g., performance based, capacity based, etc.).
  • nonvolatile memory can include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable PROM (EEPROM), or flash memory.
  • Volatile memory can include random access memory (RAM), which acts as external cache memory.
  • RAM is available in many forms such as synchronous RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct Rambus RAM (DRRAM).
  • SRAM synchronous RAM
  • DRAM dynamic RAM
  • SDRAM synchronous DRAM
  • DDR SDRAM double data rate SDRAM
  • ESDRAM enhanced SDRAM
  • SLDRAM Synchlink DRAM
  • DRRAM direct Rambus RAM
  • the memory 1008 of the subject systems and methods is intended to comprise, without being limited to, these and any other suitable types of memory.
  • Mobile device 1000 still further comprises a hybrid FDM-CDM signal generating component 1014 and a transmitter 1016 that transmits a signal (e.g., base CQI and differential CQI) to, for instance, a base station, another mobile device, etc.
  • a signal e.g., base CQI and differential CQI
  • semi-connected controller 1010 and/or hybrid FDM-CDM signal generating component 1014 may be part of processor 1006 or a number of processors (not shown).
  • the hybrid FDM-CDM signal generating component 1014 can be employed to multiplex the signal to be transmitted in the frequency as well as time domain.
  • the hybrid FDM-CDM signal generating component 1014 multiplexes the signal to maximize frequency diversity such that multiple users can transmit on non-contiguous tones.
  • FIG. 11 is an illustration of an example system 1100 that facilitates recovering a signal that employs a hybrid FDM-CDM structure, according to an aspect of the system.
  • System 1100 comprises a base station 1102 (e.g., access point, . . . ) with a receiver 1110 that receives signal(s) from one or more mobile devices 1104 through a plurality of receive antennas 1106 , and a transmitter 1124 that transmits to the one or more mobile devices 1104 through a plurality of transmit antennas 1108 .
  • Receiver 1110 can receive information from receive antennas 1106 and is operatively associated with a hybrid FDM-CDM receiving component 1112 that demodulates and despreads received information.
  • the hybrid FDM-CDM receiving component 1112 can separate signals from a group of users from different cells and can then separate out individual users within each group by employing despreading filters in time domain as well as frequency domain.
  • the despreading filters employ a code that is the inverse of the spreading code employed at the mobile device(s) 1104 .
  • Demodulated symbols are analyzed by a processor 1114 that can be similar to the processor described above with regard to FIG.
  • a memory 1116 that stores information related to estimating a signal (e.g., pilot) strength and/or interference strength, data to be transmitted to or received from mobile device(s) 1104 (or a disparate base station (not shown)), and/or any other suitable information related to performing the various actions and functions set forth herein.
  • a signal e.g., pilot
  • interference strength e.g., data to be transmitted to or received from mobile device(s) 1104 (or a disparate base station (not shown)
  • Modulator 1122 can multiplex the information for transmission by a transmitter 1126 through antenna 1108 to mobile device(s) 1104 .
  • OFDMA can be employed for the downlink transmission.
  • semi-connected controller 1118 and/or modulator 1122 may be part of processor 1114 or a number of processors (not shown).
  • FIG. 12 shows an example wireless communication system 1200 .
  • the wireless communication system 1200 depicts one base station 1210 and one mobile device 1250 for sake of brevity. However, it is to be appreciated that system 1200 may include more than one base station and/or more than one mobile device, wherein additional base stations and/or mobile devices may be substantially similar or different from example base station 1210 and mobile device 1250 described below.
  • base station 1210 and/or mobile device 1250 may employ the systems ( FIGS. 3-4 and 10 - 11 ) and/or methods ( FIGS. 5-6 ) described herein to facilitate wireless communication there between.
  • traffic data for a number of data streams is provided from a data source 1212 to a transmit (TX) data processor 1214 .
  • TX data processor 1214 formats, codes, and interleaves the traffic data stream based on a particular coding scheme selected for that data stream to provide coded data.
  • the coded data for each data stream may be multiplexed with pilot data using orthogonal frequency division multiplexing (OFDM) techniques. Additionally or alternatively, the pilot symbols can be frequency division multiplexed (FDM), time division multiplexed (TDM), or code division multiplexed (CDM).
  • FDM frequency division multiplexed
  • TDM time division multiplexed
  • CDM code division multiplexed
  • the pilot data is typically a known data pattern that is processed in a known manner and may be used at mobile device 1250 to estimate channel response.
  • the multiplexed pilot and coded data for each data stream may be modulated (e.g., symbol mapped) based on a particular modulation scheme (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM), etc.) selected for that data stream to provide modulation symbols.
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • the data rate, coding, and modulation for each data stream may be determined by instructions performed or provided by processor 1230 .
  • the modulation symbols for the data streams may be provided to a TX MIMO processor 1220 , which may further process the modulation symbols (e.g., for OFDM). TX MIMO processor 1220 then provides N T modulation symbol streams to N T transmitters (TMTR) 1222 a through 1222 t . In various embodiments, TX MIMO processor 1220 applies beamforming weights to the symbols of the data streams and to the antenna from which the symbol is being transmitted.
  • Each transmitter 1222 receives and processes a respective symbol stream to provide one or more analog signals, and further conditions (e.g., amplifies, filters, and upconverts) the analog signals to provide a modulated signal suitable for transmission over the MIMO channel. Further, N T modulated signals from transmitters 1222 a through 1222 t are transmitted from N T antennas 1224 a through 1224 t , respectively.
  • the transmitted modulated signals are received by N R antennas 1252 a through 1252 r and the received signal from each antenna 1252 is provided to a respective receiver (RCVR) 1254 a through 1254 r .
  • Each receiver 1254 conditions (e.g., filters, amplifies, and downconverts) a respective signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding “received” symbol stream.
  • An RX data processor 1260 may receive and process the N R received symbol streams from N R receivers 1254 based on a particular receiver processing technique to provide N T “detected” symbol streams. RX data processor 1260 may demodulate, deinterleave, and decode each detected symbol stream to recover the traffic data for the data stream. The processing by RX data processor 1260 is complementary to that performed by TX MIMO processor 1220 and TX data processor 1214 at base station 1210 .
  • a processor 1270 may periodically determine which precoding matrix to utilize as discussed above. Further, processor 1270 may formulate a reverse link message comprising a matrix index portion and a rank value portion.
  • the reverse link message may comprise various types of information regarding the communication link and/or the received data stream.
  • the reverse link message may be processed by a TX data processor 1238 , which also receives traffic data for a number of data streams from a data source 1236 , modulated by a modulator 1280 , conditioned by transmitters 1254 a through 1254 r , and transmitted back to base station 1210 .
  • the modulated signals from mobile device 1250 are received by antennas 1224 , conditioned by receivers 1222 , demodulated by a demodulator 1240 , and processed by a RX data processor 1242 to extract the reverse link message transmitted by mobile device 1250 . Further, processor 1230 may process the extracted message to determine which precoding matrix to use for determining the beamforming weights.
  • Processors 1230 and 1270 may direct (e.g., control, coordinate, manage, etc.) operation at base station 1210 and mobile device 1250 , respectively. Respective processors 1230 and 1270 can be associated with memory 1232 and 1272 that store program codes and data. Processors 1230 and 1270 can also perform computations to derive frequency and impulse response estimates for the uplink and downlink, respectively.
  • the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof.
  • the processing units may be implemented within one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.
  • a code segment may represent a procedure, a function, a subprogram, a program, a routine, a subroutine, a module, a software package, a class, or any combination of instructions, data structures, or program statements.
  • a code segment may be coupled to another code segment or a hardware circuit by passing and/or receiving information, data, arguments, parameters, or memory contents. Information, arguments, parameters, data, etc. may be passed, forwarded, or transmitted using any suitable means including memory sharing, message passing, token passing, network transmission, etc.
  • the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein.
  • the software codes may be stored in memory units and executed by processors.
  • the memory unit may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.
  • system 1300 that employs a hybrid FDM-CDM structure to facilitate transmission of a single carrier based control channel.
  • system 1300 may reside at least partially within a mobile device.
  • system 1300 is represented as including functional blocks, which may be functional blocks that represent functions implemented by a processor, software, or combination thereof (e.g., firmware).
  • System 1300 includes a logical grouping 1302 of electrical components that facilitate reverse link transmission.
  • logical grouping 1302 may include an electrical component for modulating a signal by employing a hybrid FDM-CDM structure.
  • the hybrid FDM-CDM structure provides maximum frequency diversity for a given user by permitting a user to transmit over non-contiguous tones.
  • logical grouping 1302 may comprise an electrical component for performing CDM in time domain.
  • the CDM in time domain can allow users in neighboring cells to employ the same sequence for CDM in frequency domain. Thus, pilots of users in neighboring cells using the same sequence for CDM in frequency domain will not interfere due to the CDM performed in time domain.
  • system 1300 may include a memory 1308 that retains instructions for executing functions associated with electrical components 1304 and 1306 . While shown as being external to memory 1308 , it is to be understood that one or more of electrical components 1304 and 1306 may exist within memory 1308 .
  • System 1400 that identifies signals from a specific user in a specific cell, in accordance with an aspect of the specification.
  • System 1400 may reside within a base station, for instance.
  • system 1400 includes functional blocks that may represent functions implemented by a processor, software, or combination thereof (e.g., firmware).
  • System 1400 includes a logical grouping 1402 of electrical components that can act in conjunction.
  • Logical grouping 1402 may include an electrical component for demodulating a received signal 1404 .
  • a receiver may be included in a base station to receive a message from a mobile device that transmits signals employing a hybrid FDM-CDM structure.
  • the component 1404 can demodulate the signal to identify signals from users in a specific group.
  • logical grouping 1402 may include an electrical component for performing signal despreading in the time domain 1406 .
  • logical grouping 1402 may comprise an electrical component for performing signal despreading in the frequency domain 1408 .
  • the despreading operation in time and frequency domain can identify a signal from a specific user in an identified group.
  • system 1400 may include a memory 1410 that retains instructions for executing functions associated with electrical components 1404 , 1406 , and 1408 . While shown as being external to memory 1410 , it is to be understood that electrical components 1404 , 1406 , and 1408 may exist within memory 1410 .
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